<template>
  <div class="wrapper">
    <!-- header部分 -->
    <header>
      <p>商家列表</p>
    </header>

    <!-- 商家列表部分 -->
    <ul class="business">
      <!-- vue中的绑定事件 -->
      <li v-for="item in businessArr" @click="toBusinessInfo(item.businessId)" v-bind:key="item.businessId">
        <div class="business-img">
          <img :src="item.businessImg" />
          <div class="business-img-quantity" v-show="item.quantity>0">{{item.quantity}}</div>
        </div>
        <div class="business-info">
          <h3>{{item.businessName}}</h3>
          <p>&#165;{{item.starPrice}}起送 | &#165;{{item.deliveryPrice}}配送</p>
          <p>{{ item.businessExplain }}</p>
        </div>
      </li>
	   
    </ul>

    <!-- 底部菜单部分 -->
    <Footer></Footer>
  </div>
</template>
<script>
import Footer from "../components/Footer.vue";

export default {
  name: "BusinessList",
  data() { 
    return {
      orderTypeId: this.$route.query.orderTypeId, //点餐的分类
      businessArr:[], //保存查询回来的所有的商家
      user: {} //表示是否登陆的用户对象
    }
  },
  created() { 
    this.user = this.$getSessionStorage("user"); //取出登陆的用户
    //向后端发送请求获取要点餐的分类商家
    this.$axios.post('BusinessController/listBusinessByOrderTypeId', this.$qs.stringify({
      orderTypeId:this.orderTypeId
    })).then(response => { 
      this.businessArr = response.data;
      //判断是否登陆了
      if (this.user!=null) { 
        //查询当前登陆着的购物车信息，更新当前购买过的商家的销量
        this.listCartByUserId();
      }
    }).catch(error => { 
      console.error(error);
    })
  },
  components: {
    Footer,
  },
  methods: {
    toBusinessInfo(businessId) {
      this.$router.push("/businessInfo");
      //   this.$router.push({path:'/businessList'});
  this.$router.push({path:'/businessInfo',query:{businessId:businessId}});
    },
    listCartByUserId() { 
      this.$axios.post('CartController/listCart', this.$qs.stringify({
        userId: this.user.userId
      })).then(response => {
        let cartArr = response.data;
        //遍历商家
        for (let businessItem of this.businessArr) {
          businessItem.quantity = 0;  //默认销量
          for (let cartItem of cartArr) {
            if (cartItem.businessId == businessItem.businessId) {  //表示购物车中曾经购买过该商家的餐品
              businessItem.quantity += cartItem.quantity;
            }
          }
        }
        this.businessArr.sort();
        console.log(this.businessArr);
      }).catch(error => {
        console.error(error);
      });
    }
  }
};
</script>

<style scoped>
/****************** 总容器 ******************/
.wrapper {
  width: 100%;
  height: 100%;
}

/****************** header部分 ******************/
.wrapper header {
  width: 100%;
  height: 12vw;
  background-color: #0097ff;
  color: #fff;
  font-size: 4.8vw;

  position: fixed;
  left: 0;
  top: 0;
  z-index: 1000;

  display: flex;
  justify-content: center;
  align-items: center;
}

/****************** 商家列表部分 ******************/
.wrapper .business {
  width: 100%;
  margin-top: 12vw;
  margin-bottom: 14vw;
}

.wrapper .business li {
  width: 100%;
  box-sizing: border-box;
  padding: 2.5vw;
  border-bottom: solid 1px #ddd;
  user-select: none;
  cursor: pointer;

  display: flex;
  align-items: center;
}

.wrapper .business li .business-img {
  /*这里设置为相当定位，成为business-img-quantity元素的父元素
  absolute:绝对定位
  relative：相对定位
  */
  /* position: absolute; */
  position: relative;
}

.wrapper .business li .business-img img {
  width: 20vw;
  height: 20vw;
}

.wrapper .business li .business-img .business-img-quantity {
  width: 5vw;
  height: 5vw;
  background-color: red;
  color: #fff;
  font-size: 3.6vw;
  border-radius: 2.5vw;

  display: flex;
  justify-content: center;
  align-items: center;

  /*设置成绝对定位，不占文档流空间*/
  position: absolute;
  right: -1.5vw;
  top: -1.5vw;
}

.wrapper .business li .business-info {
  margin-left: 3vw;
}

.wrapper .business li .business-info h3 {
  font-size: 3.8vw;
  color: #555;
}

.wrapper .business li .business-info p {
  font-size: 3vw;
  color: #888;
  margin-top: 2vw;
}
</style>
